Monday, 25 April 2016

What is Holography and Maser

HolographyWhen an object is photographed by a camera, a two dimensional
image of three dimensional object is obtained. A three dimensional
image of an object can be formed by holography. In ordinary
photography, the amplitude of the light wave is recorded on the
photographic film. In holography, both the phase and amplitude of the
light waves are recorded on the film. The resulting photograph is called Hologram

MASER
The term Maser stands for Microwave Amplification by
Stimulated Emission of Radiation. The working of maser is similar to
that of laser. The maser action is based on the principle of population
inversion followed by stimulated emission. In maser, the emitted
photon, during the transition from the metastable state belongs to the
microwave frequencies. The paramagnetic ions are used as maser
materials. Practical maser materials are often chromium or gadolinium
ions doped as impurities in ionic crystals. Ammonia gas is also a maser
material. Maser provides a very strong tool for analysis in molecular spectography